161403786 has 32 divisors (see below), whose sum is σ = 360576000. Its totient is φ = 53516160.

The previous prime is 161403769. The next prime is 161403787. The reversal of 161403786 is 687304161.

161403786 is a `hidden beast` number, since 1 + 614 + 0 + 37 + 8 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 161403786.

It is not an unprimeable number, because it can be changed into a prime (161403787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2490 + ... + 18138.

It is an arithmetic number, because the mean of its divisors is an integer number (11268000).

Almost surely, 2^161403786 is an apocalyptic number.

161403786 is an abundant number, since it is smaller than the sum of its proper divisors (199172214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161403786 is a wasteful number, since it uses less digits than its factorization.

161403786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15851 (or 15845 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 161403786 is about 12704.4789739682. The cubic root of 161403786 is about 544.4665947981.

The spelling of 161403786 in words is "one hundred sixty-one million, four hundred three thousand, seven hundred eighty-six".